The relationship between the Asian summer monsoon (ASM) and westerlies at different timescales is still under discussion. In this paper, we present Holocene precipitation records derived from loess and lake sediment in the northeastern Tibetan Plateau and reconstruct changes in the strength of the ASM during the Holocene. Compared with other Eurasian paleohydroclimatic records, we find that precipitation variations between ASM- and westerlies-dominant regions are positively correlated (anti-correlated) at millennial (sub-orbital) timescales. Based on the analysis of the TraCE-21 results, we suggest that Atlantic meridional overturning circulation may be the primary reason for this in-phase pattern at millennial timescales whereas this anti-phased pattern at sub-orbital timescales is attributed to precessional changes. Due to different response mechanisms, the relationship between the ASM and westerlies may differ significantly at different timescales, which highlights the complex dynamic characteristics of atmospheric systems in the Northern Hemisphere and the challenges for future predictions.

亚洲夏季风（ASM）和不同时间尺度的西风之间的关系仍在讨论中。在本文中，我们提供了来自青藏高原东北部的黄土和湖泊沉积物的全新世降水记录，并重建了全新世期间ASM强度的变化。与其他欧亚古气候记录相比，我们发现在ASM和西风为主的区域之间的降水变化在千年（亚轨道）时标上呈正相关（反相关）。根据对TraCE-21结果的分析，我们认为大西洋子午线翻转环流可能是这种在千禧年尺度下同相模式的主要原因，而在亚轨道尺度下这种反相位模式则是由于旋进变化。